Originally Posted by David Meverden
True , though those aren't very quantifiable. And many moves, like a dragon flag, require more than just abdominals.
Ultimately there is just nothing universal. People can come on here and say "my deadlift went from 300 to 450 on training program X" but you can't make an equivalently quantitative argument for abdominal strength.
Maybe we could make something up and try to get it to catch on? How about max weighted hanging leg raise? You attach weight to your ankles, hang on a bar, and slowly bring your legs to an L-position.
Weighted crunches on an inflatable exercise ball and the cable crunch are both quantifiable, as long as there isn't any cheating involved, which is the same with just about any other exercise anyways.